Disclosure About Fair Values of Financial Instruments - Summary of Assets Recorded at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Individually evaluated loans, net of allocated allowance for credit losses		$ 147,618		$ 101,939
Level 2
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans held for sale		38,221	$ 87,649
Fair Value, Nonrecurring
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans held for sale		38,221	87,649
Individually evaluated loans, net of allocated allowance for credit losses	[1]	128,519	101,561
Other real estate and repossessed assets		11,608
Other real estate			1,628
Total assets		178,348	190,838
Fair Value, Nonrecurring | Level 2
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Loans held for sale		38,221	87,649
Total assets		38,221	87,649
Fair Value, Nonrecurring | Level 3
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Individually evaluated loans, net of allocated allowance for credit losses	[1]	128,519	101,561
Other real estate and repossessed assets		11,608
Other real estate			1,628
Total assets		$ 140,127	$ 103,189

[1] Prior to the adoption of CECL on January 1, 2020, these loans were known as Impaired loans, net of specific allowance.